A vertical centrifugal casting equipment for manufacturing twisted sheet tubes

Abstract

The invention relates to a vertical centrifugal casting equipment for manufacturing twisted sheet tubes, which includes an auxiliary manufacturing mechanism and a forming mechanism. The upper middle part of the auxiliary manufacturing mechanism is provided with a forming mechanism, and the auxiliary manufacturing mechanism is arranged on the existing ground. The invention adopts the design concept of combined splicing to carry out the vertical centrifugal casting of twisted sheet tubes. The auxiliary mechanism set up can use the centrifugal force to vibrate the casting material. At the same time, the casting material can also be shaken up and down. The combination of the reciprocating shaking treatment can greatly reduce the existence rate of air bubbles, thereby improving the forming quality of the twisted sheet tube. The combined splicing method adopted by the forming mechanism can realize the recycling of the structure, which in turn is conducive to reducing the production cost.

Description

technical field [0001] The invention relates to the field of twisted sheet tube processing, in particular to a vertical centrifugal casting device for manufacturing twisted sheet tubes. Background technique [0002] The tube of the tube cracking furnace is mainly used in the cracking production of chemical raw materials such as ethylene. The maximum heat transfer resistance in the tube of the tube cracking furnace is the boundary layer with the inner wall of the tube. If the heat transfer resistance of the boundary layer can be reduced, it will be greatly improved. The heat transfer effect of the furnace tube, the twisted sheet tube enhanced heat transfer technology is developed based on this, in which the twisted sheet tube is a precision integral casting tube with twisted sheets inside the tube, and the twisted sheet tube is formed by integral casting with the help of a mold , the twisted sheet tube can make the fluid passing through it change from the original plunger flo...

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Problems solved by technology

[0002] The tube of the tube cracking furnace is mainly used in the cracking production of chemical raw materials such as ethylene. The maximum heat transfer resistance in the tube of the tube cracking furnace is the boundary layer with the inner wall of the tube. If the heat transfer resistance of the boundary layer can be reduced, it will be greatly improved. The heat transfer effect of the furnace tube, the twisted sheet tube enhanced heat transfer technology is developed based on this, in which the twisted sheet tube is a precision integral casting tube with twisted sheets inside the tube, and the twisted sheet tube is formed by integral casting with the help of a mold , the twisted sheet tube can make the fluid passing through it change from the original plunger flow to the swirl flow, and form a lateral scour effect on the inner wall of the furnace tube, thereby improving the convective heat transfer effect, but the following problems will occur during the forming process of the twisted sheet tube: 1. When the forming mold of the twisted sheet tube is a non-combined and spliced ​​structure, the production cost of a single twisted sheet tube is relatively high, and the integral structure is not conducive to timely overall cleaning operations, so that the residual casting material is easier to be replaced with a thicker one. The presence of a coagulated layer;

[0003] 2. There is a change in the stability rate of the molding die as a whole during the pouring process, and the deflection of the molding die is more likely to cause spillage of the casting material. Under the flow of the casting material itself, the filling uniformity of the casting material in the pouring process Lower, so that defects such as air bubbles are more likely to exist

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